A sophisticated and technologically advanced urban culture is evident in the Indus Valley civilization. An amazing sewage and drainage system, uniform standard of weights and measures, and advanced buildings are evidence of this. The ancient Harappan systems of sewage and drainage that were developed and used in cities throughout the Indus Empire were far more advanced than any found in contemporary urban sites in the Middle East and even more efficient than those in some areas of modern India. The Harappans were among the first to develop a system of uniform weights and measures. The advanced architecture of the Harappans is shown by their impressive dockyards, granaries, warehouses, brick platforms and protective walls. The massive citadels of Indus cities that protected the Harappans from floods and attackers were larger than most Mesopotamian ziggurats. Unique Harappan inventions include an instrument which was used to measure whole sections of the horizon and the tidal dock. In addition, the Harappans evolved new techniques in metallurgy, and produced copper, bronze, lead and tin. Clearly, the contributions of the Indus Valley civilization to the fields of science and technology are numerous.
The Harappans were great lovers of the fine arts, and especially dancing, painting, and plastic arts. Various sculptures, seals, pottery, gold jewelry, terracotta figures and other interesting works of art indicate that the Harappans had fine artistic sensibilities. The art of the Harappans is highly realistic. The sheer anatomical details of much of Harappan art is unique, and terracotta art is also noted for its extremely careful modeling of animal figures. Sir John Marshall once reacted with surprise when he saw the famous Harappan bronze statuette of the slender-limbed "dancing girl" in Mohenjo-daro:
When I first saw them I found it difficult to believe that they were prehistoric; they seemed so completely to upset all established ideas about early art. Modeling such as this was unknown in the ancient world up to the Hellenistic age of Greece, and I thought, therefore, that some mistake must surely have been made; that these figures had found their way into levels some 3000 years older than those to which they properly belonged. ... Now, in these statuettes, it is just this anatomical truth which is so startling; that makes us wonder whether, in this all-important matter, Greek artistry could possibly have been anticipated by the sculptors of a far-off age on the banks of the Indus.